DE2446372A1 - VALVE - Google Patents

Description

PATENT LAWYERS

K. SIEBERT G. GRÄTTINGER

Dlpl.-Ing. Dlpl.-Ing., Dipl.-Wlrtjidi.-lng.

813 Starnberg near Munich Postlach 1649. Almaidaweg 12 Telalon (08151) I 27 30 and 41IS

the

Attorney's file

6189/1

TAPCO INTEPNATIONAL, INC. P.O. Box 19527, Houston, Texas 77024 / üSA

Valve

Conventionally, as overpressure shut-off devices ball valves for high temperature and high pressure flows and gate valves used at lower pressures and temperatures.

Experience has shown that, in the case of solid flows, ball valves because of the inclusion of powder particles leak over time while gate valves

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Postal checking account Munich 2720-604 District Park Starnberg 68940 Deutsche Bank Starnberg 59/17570

are unsuitable at high pressures and temperatures because the flat valve plates warp and the high pressures require extremely large plate thicknesses.

The invention overcomes these disadvantages. It creates a valve which can be used successfully in devices with erosive solid, gas or liquid flows .

Furthermore, the invention provides a valve that it can be used successfully at temperatures flows with high pressures and high Tetrpera-.

The invention further provides a valve with a number of sealing surfaces which are protected against the erosive effect of the particles of a solid flow or of solid particles carried along in liquid or gas flows.

For this purpose, the invention provides a double disk valve with two actuatable valve disks, a pressurizable double bellows seal for each valve disk and a chamber formed between the valve disks, which can also be pressurized, in order to provide a shut-off for erosive solid, liquid and gas flows of high pressure and to create high temperature.

The valve disks can preferably be actuated independently of one another.

The invention also provides for the chamber in the flow channel

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between the spaced apart in the flow channel To arrange valve plates.

In addition, the invention provides a device for collecting solid particles torn from the flow with an associated drain for these particles.

Finally, the invention provides a control device for sequential control of the valve functions, - actuation of the Valve disc and pressurizing the bellows and between the chamber lying in front of the valve plates.

Further features of the invention emerge from the following Description of a preferred embodiment in conjunction with the accompanying drawing. On this one is

Fig. 1 is a sectional view along line 1-1 from Fig. 2, which shows the double disk valve according to the invention,

Figure 2 is a top plan view of the valve taken along line 2-2

from Fig. 1,

3 is a sectional view of the valve taken along line 3-3

from Fig. 2,

4 shows a schematic representation of a control device

for the sequence control of the valve and

Fig. 5 is a sectional view showing a structural seal

shows in detail.

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In the drawing and initially with reference to FIG. 1, a double disk valve is shown which has a valve body 10 made up of the two sections 10a and 10b. A central flow channel 12 extends through this. Two valve disks, the upstream valve disk 14a and the downstream valve disk 14b, are arranged at a distance from one another and form a flange 16 between them in the valve body 10. A bellows seal 20a is located on one side of the upstream valve disk 14a, and a bellows expansion 22a on its other side. A second pair of bellows seals 20b and 22b is located in a corresponding arrangement on the downstream valve disk 14b. As will be explained in greater detail below, the bellows include pressure seals which seal against the upstream and downstream sides of the valve disks 14a and 14b . In the valve body 10 there is an inlet opening 28 through which. pressure can be introduced into the intermediate chamber 16 located between the valve disks 14a and 14b. As will be explained further below, when pressure is applied to the bellows seals 20a, 22a, 20b, and 22b and in the intermediate duct 16 through the inlet opening, the valve disks 14a and 14b are sealed on their upstream and downstream sides and at the same time from the between a desired pressure is applied to them lying side, which results in a very effective and high-performance seal under conditions of high pressures and temperatures as well as with flow media with solid particles.

The pressure is applied to the bellows seals 20a and 22a via an inlet opening 3 © a and that to the bellows seals 20a and 22a leading lines 32a and 34a applied.

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Similarly, the inside of the bellows seals 20b. and 22h via the inlet opening 30b and to the Seaweed seals 20b and 22b carrying lines 32b and 35b pressure created. Each of the bellows seal units is one of a kind circumferentially extending bellows housing, which on the side of the surface to be sealed The bellows housings 24a and 26a contain the bellows seals 20a and 22a, the bellows housings 24b and 26b, the bellows seals 20b and 22b, respectively. The bellows housings 26a and 26b are an integral part of the valve disks 14a and 14b, that is, they are carried along by them and rotate together with you. Accordingly, the pressure lines 34a and 34b, via which the pressure to the interior of the bellows housing 26a and 26b is applied, as shown, flexible lines.

The bellows seal shown in FIG. 5 - and the same applies to the other bellows seals - is included a central flexible bellows 21a connected to inner and outer bellows end plates 23a and 25a. A part the outer bellows end plates 25a is designed as a thin metal sealing plate 27a which seals against a valve surface. The remaining parts of the inner and outer bellows end plates 23a and 25a are also made of metal, the inner bellows end plate 23a being welded into the bellows housing 24a, while the outer bellows end plate 25a with the sealing plate 27a is free and according to the contraction and the expansion of the bellows 21a can move. If pressure is applied to the bellows 21a, the outer bellows end plate moves 25a with the sealing plate 27a with respect to the bellows housing 24a to the outside, until the flexible sealing plate on

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engages a valve surface and is deformed in the process, being a very effective pressure seal for high Temperatures and pressures results.

In the case of the bellows seal shown, the individual parts are made of metal, namely the bellows 21a. Spring metal, for example spring steel, and also the sealing plate 27a is made of thin, deformable metal. However, it can also other materials are used, the material used depends only on the conditions of use and will each chosen so that it is suitable for those in question Pressures, temperatures, flow media, etc. is suitable.

As already mentioned, the bellows seals 22a, 20b and 22b have the same arrangement of parts as the bellows seal 20a and also work in the same way as this, so that a detailed description of these three other bellows seals can be omitted.

Gertäß Fig. 1 forms the annularly extending surface 29 of the valve disk 14a a sealing surface for the flexible sealing plate 27a of the bellows seal 20a and the like The annularly extending surface 31 forms a sealing surface for the sealing plate (not shown) the bellows seal 22a. Similarly, the sealing surface 33 of the valve plate 14b, which extends in the shape of a ring, lies the deformable sealing plate of the bellows seal 20b, and also the deformable one on the annular sealing surface 35 Sealing plate of the bellows seal 22b.

The deformable sealing plates of the algae seals 22a, 20b and 22c are not shown, but are as already

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mentioned, constructed exactly the same as that of the bellows seal 20a.

In this way it becomes complete and effective Sealing on the upstream and downstream sides each of the two valve disks 14a and 14b is reached.

Each of the two valve disks 14a and 14b is provided with an actuating device 36a and 36b, respectively. The actuating device 36a, and correspondingly also the actuating device 36b, comprises a rotatable shaft 38a which extends through a stuffing box 14a and a bearing bushing 41a into a support bearing 42, the shaft 38 being connected to an outwardly pointing arm 44a of the valve disk 14a. The gland 40a includes an annular seal 46a and a cover 48a which seal around the shaft 38a. As already mentioned, the actuating device 36b is constructed accordingly, corresponding grommets have been given the same number as reference characters and the letter "b" ^{instead of the letter "a H".}

As best seen in Fig. 2, are for the valve head 14a and 14b guide ribs 50a and 50b are provided which the Guide the valve disc during their opening and closing movement.

When the controls 36 "a and 36b in action occur, the valve disks 14a and 14b along their respective path in an open or a closed Position.

To simplify the description, the details have been given

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of the actuating devices 36a and 36b with regard to the actuation of the shafts 38a and 38b and thus the valve disks 14a and 14b are omitted. In principle, any devices can be used for this, be they manual, mechanical, electrical, pneumatic, hydraulic or similar.

The actually moving the valve discs 14a and 14b in their open or closed position and the pressurization of the pressure seals and the intermediate chamber can indeed take place as desired, but one aspect of the invention is a control device for sequence control of the functions of the valve disc and of pressurizing the Balgendichtunaen and the intermediate chamber the controller to which reference is now made is illustrated in FIG.

The sequence control comprises a command generator 50 with an "open", "close" and "hold" position, which sends a control signal to the actuating device 36a for the upstream valve disk 14a and, at the same time, a signal to each of the AND gates 52, 54, 56, 58, 60 and 62, the output signals of each gate each acting on an associated solenoid valve of the solenoid valves 64, 66, 68, 70 and which the pressure medium coming from a suitable source (not shown) via a manifold 74 Feed bellows seals 20a and 22a, pressure chamber 16 and bellows seals 20b and 22b. Each of the gates can only then to switching of the solenoid valve associated with it, if the corresponding signal is present at all its inputs. If the "close" position is present on the command transmitter 50, this first reaches the actuating device 36a located upstream, which is initially the actuating device 36a located upstream

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Brings valve disk 14a in the closed position, whereby each further solids flow through the valve is prevented. As soon as the closing movement of the upstream valve disk 14a is terminated by the actuating device 36a, acts on the gates 52, 54, 56 and 58 given a signal "end of movement", which then all input signals are present at gates 52, 54 and 58 in the correct manner for actuating solenoid valves 64 and 66 on the one hand 'which increases the flow of pressure medium in lines 76 and 78 to bellows seals 20a and 22a releases and on the other hand the rotating device 36b comes into action, which the downstream valve disk 14b brings in the closed position. As soon as this movement has ended, an "end of movement" signal is sent to the gates 56, and 62, whereby the conditions are then given for the solenoid valves 70 and 72 to switch, so that pressure medium flows through line 80 into bellows seal 20b and line 82 into bellows seal 22b can get. At the same time there will be another at gate 56 Generated input signal, which the signals necessary to generate a corresponding output signal on the Completed entrance of this gate, which becomes solenoid valve c. 68 brought into the position shown, so that pressure medium via the line 88 through the solenoid valve 68 enters the intermediate chamber 16 and this is pressurized.

The position of the solenoid valves shown in FIG. 4 corresponds to that which is present when the actuating devices conclude.

The control has a "hold" and an "open" position

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on, which sends a corresponding signal to the gates, and which in turn sends the signals to the solenoid valves reach. The position of the solenoid valves and flow lines for these positions have not been shown or in detail as this does not seem necessary. In short, however, the following applies: If you give the control command, the Bring valve disks 14a and 14b into the open position, a signal appears at the solenoid valves 64, 66, 68, 70 and 72, by means of which they are brought into a position for which the pressure can escape from the bellows seals and the Zwischenkairaner and after the short time, which is necessary to decrease the pressure, the actuating devices move the valve disk assigned to them into the open position bring.

The control signal devices, the gates and solenoid valves, are all of conventional design and are commercially available, so that a detailed description of these parts is not necessary.

As best seen in Figure 2, each of the valve disks an associated collection chamber 37a and 37b for solid particles removed from the flow, these chambers are closed by removable cover plates 39a and 39b. The collected in the collecting chambers 37a and 37b Solid particles can via discharge lines 41a and 41b be drained by opening a drain valve 43a or 43b.

As can be seen in Fig. 2, the individual parts of the chamber are releasably connected to one another by screw bolts.

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Is now in operation, assuming that the valves are open, a command "Close" 'by pressing the "Close" Button (not shown) on the command transmitter 50, the upstream valve plate 14a closes first, after which the two upstream bellows seals 20a and 22b are pressurized and the downstream valve disk 14b is brought into the closed position. Once the downstream valve disk 14b is in this position, the downstream bellows seals 20b and 22b are pressurized and furthermore on pressure is applied to the intermediate chamber between the two valve disks 14a and 14b. This gives an excellent seal for very high pressures.

If the valve is to open, the "open" button on the command transmitter is pressed, whereby first the pressure is removed from the bellows seals and the intermediate buyer 16 and then the rotating devices 36a and 36b come into action, which brings the valve disks 14a and 14b into the open position.

It should be noted that the baloon seals are completely outside of the flow channel 12 of the valve are arranged, what the valve for flow media, the erosive solids, for example as a powder, makes it very suitable. By providing an intermediate chamber 16, which is under pressure can be set, very high pressures can be sealed by the double disk valve according to the invention. Normally the bellows seals and the intermediate chamber are set to pressure values which correspond to the pressures occurring during use correspond.

Claims: 5098U / 0391

Claims (1)

Patent claims: 1.) Valve, characterized by a valve body (10) with a flow channel (12) extending through it, two releasing or closing the flow channel Valve head (14a, 14b), these being arranged at a distance from one another and in the closed position include between them a pressurizable intermediate chamber (16) opening and closing devices for the valve disks, pressurizable, the seats of the valve disc against the flow channel sealing seals and means for generating pressure on the seals and in the pressure chamber. 2. Valve according to claim 1, characterized in that the seals under pressure against the valve plates (14a, 14b) expandable sealing bodies which are arranged on both sides of both valve plates (14a, 14b) and which extend around the flow channel (12), and the housing (24a, 26a; 24b, 26b), which grasp the sealing body outside of the flow channel (12). 5098U / 0391 3. Valve according to claim 2, characterized in that in each case one of the two housings (26a; 26b) assigned to a valve disk (14a; 14b) is integral with the associated valve disk, that the upstream side of the integrally connected housing has a sealing surface for the forms the sealing body associated with the other housing of the same valve disk, and that a further sealing surface is provided which cooperates with the sealing body associated with the integrally connected housing. 4. Valve according to one of the preceding claims, characterized characterized in that the opening and closing devices for the two valve plates (14a, 14b) can be actuated independently of one another. 5. Valve according to one of the preceding claims, characterized in that the openings and closing devices and the device for generating pressure comprise a device which brings the upstream valve disk (14a) into the closed position, further a device which applies pressure after reaching its closed position brings the seals of this valve disk and at the same time performs the closing process for the downstream lie conditions the valve disk (14a) , and also a device that applies pressure to the seals of this valve disk and the intermediate chamber (16) after reaching the closed position of the downstream valve disk. September 20, 1974 / 954d 5098U / 0391 Blank page